Change an element in the last row of a DataFrame

Question

I set up a simple DataFrame in pandas:

a = pandas.DataFrame([[1,2,3], [4,5,6], [7,8,9]], columns=[\'a\',\'b\',\'c\'])
>>> print a
   a  b  c
0  1  2         


        

Answer 1

Alright I've found a way to solve this problem without chaining, and without worrying about multiple indices.

a.iloc[-1, a.columns.get_loc('a')] = 77
>>> a
   a  b  c
0  1  2  3
1  4  5  6
2 77  8  9

I wasn't able to use iloc before because I couldn't supply the column index as an int, but get_loc solves that problem. Thanks for the helpful comments everyone!